fix major bug with unflushed stdio

Author: andrew-taylor

dcc_check_output.c

@@ -1,3 +1,5 @@
+static unsigned char *expected_stdout;
+
 #if !__CHECK_OUTPUT__ || !__I_AM_SANITIZER1__
 
 static int init_check_output(void) {
@@ -11,11 +13,14 @@ static void __dcc_check_close(int fd) {
 }
 
 static void __dcc_check_output_exit(void) {
-	debug_printf(3, "__dcc_cleanup_before_exit\n");
-	fflush(stdout);
+	debug_printf(3, "__dcc_check_output_exit\n");
+	if (expected_stdout) {
+		fflush(stdout);
+	}
 }
 
 static void disable_check_output(void) {
+	expected_stdout = NULL;
 }
 
 #else
@@ -27,8 +32,6 @@ static void disable_check_output(void) {
 //lins longer than this will produce an error if output checking enabled
 #define ACTUAL_LINE_MAX 65536
 
-static unsigned char *expected_stdout;
-
 static int ignore_case;
 static int ignore_empty_lines;
 static int ignore_trailing_white_space;
@@ -118,7 +121,7 @@ static void __dcc_check_close(int fd) {
 }
 
 static void __dcc_check_output_exit(void) {
-	debug_printf(3, "__dcc_cleanup_before_exit\n");
+	debug_printf(3, "__dcc_check_output_exit\n");
 	if (expected_stdout) {
 		fflush(stdout);
 		__dcc_check_all_output_seen_at_exit();

dcc_dual_sanitizers.c

@@ -141,9 +141,6 @@ static void disconnect_sanitizers(void) {
 	if (synchronization_terminated) {
 		return;
 	}
-	// sanitizer2 sends SIGUSR1 if its printing an error
-	signal(SIGUSR1, SIG_IGN);
-	signal(SIGPIPE, SIG_IGN);
 #if __I_AM_SANITIZER1__
 	close(to_sanitizer2_pipe[1]);
 	close(from_sanitizer2_pipe[0]);
@@ -164,6 +161,9 @@ static void wait_for_sanitizer2_to_terminate(void) {
 	set_signals_default();
 	debug_printf(3, "waiting\n");
 	if (!sanitizer2_killed) {
+		// sanitizer2 sends SIGUSR1 if its printing an error
+		signal(SIGUSR1, SIG_IGN);
+		signal(SIGPIPE, SIG_IGN);
 		pid_t pid = wait(NULL);
 		debug_printf(3, "wait returned %d\n", pid);
 		if (pid != sanitizer2_pid) {

dcc_util.c

@@ -186,6 +186,7 @@ static void set_signals_default(void) {
 }
 
 static void __dcc_signal_handler(int signum) {
+	debug_printf(2, "received signal %d\n", signum);
 	set_signals_default();
 #if __N_SANITIZERS__ > 1
 #if __I_AM_SANITIZER1__
@@ -196,7 +197,6 @@ static void __dcc_signal_handler(int signum) {
 			__dcc_error_exit();
 		}
 	} else if (signum == SIGUSR1) {
-		debug_printf(2, "received SIGUSR\n");
 		__dcc_error_exit();
 	}
 #else

docs/eof_byte.md

@@ -1,4 +1,4 @@
-Accidentally printing the special **EOF** value returned by the functions _getchar_, _getc_ and _fgetc_.
+Accidentally printing the special **EOF** value returned by the functions _getchar_, _getc_ and _fgetc_ is common bug.
 
 For example, this program prints  the **EOF** value before the loop exits: